Which species contains the same number of neutrons as $$\({ }_{6}^{14} \mathrm{C}\)$$ and the same number of electrons as $$\({ }_{11}^{23} \mathrm{Na}^{+}\)$$?

1.2.1 define the term isotope in terms of numbers of protons and neutrons

1.2.2 understand the notation for isotopes, where is the mass or nucleon number and is the atomic or proton number

1.2.3 state that and explain why isotopes of the same element have the same chemical properties state that and explain why isotopes of the same element have different physical properties, limited to mass and density

2.3.1.1 the prediction of ionic charge from the position of an element in the Periodic Table

2.3.1.2 recall of the names and formulae for the following ions:

2.3.2 write and construct equations (which should be balanced), including ionic equations (which should not include spectator ions)

2.3.3 use appropriate state symbols in equations

2.3.4 define and use the terms empirical and molecular formula

2.3.5 understand and use the terms anhydrous, hydrated and water of crystallisation calculate empirical and molecular formulae, using given data